Pulse Air Injection System: Description

The Pulse Air Injection Reactor (PAIR) system is used on some 2.0L 4-cylinder engines.

This system is a non-pump type air injection system. This system uses engine exhaust pulses to draw fresh air into the exhaust system.

This helps to further oxidize hydrocarbon (HC) and carbon monoxide (CO) emissions. A single pulse air valve with 4 check valves, 1 for each exhaust port, is used.